Porcelain repairing method and composition



. then be added. The addition of United States Patent PORCEiJAIN REPAIRING ,METHODAND r COMPOSITION James EI Giles, deceased,=late of Memphis, Tenm, by GertrutleGiles'Deeker; execnt'rix; Memphis, Tenn.

Na Drawing: Application February 6, 1956 Serial No. 563,433 S'Claims; onus-=2):

This invention -"relates= to 'repairing damaged porcelain and mere particularly: 'to a composition and-process for restoringidamagedtporcelaini h .Heretofore 'it -has'- not" beenpossible -"to repair damaged places? on porcelain at thesittof the porcelain object in a simple inexpensivemanner so thatthe repaired portion would not benoticeable a'nd furtherwould adhere to the surface-andhave similar str ength characteristics to the original porcelain. I

Itis-arWoBject' of the presenfi inventibn' to provide a niethod of repairing damaged-porcelain which maybe accomplishedwat an -matron: withoutthe 'necessity for ex= pensive equipment.

It is a further object of the present invention to provide a compositi'on sui'table for use "in repairing damaged porcelain.

These and other objects and, the. nature and advantages oftheiinstht invention will be apparent from the following .des'crip'tion.

n1 accordancewith" the present invention, it hasbeen found'that'a-dafriagw place in porcelain can be: repaired by cleaning thep'ortion to be repaired, applying a particular undercoating to-buildmp the damaged portion, applying a glaze coating on. the, undercoating; .followed bybakingth'e 'outer coating? The firs't step inthe' reeessrelatestd the cleaning of the damaged porcelain object to be repaired. This is preferably accomplished by sanding, but other equivalent methods may be utilized.

The un'dercoating is next applied. The undercoating consists of a mixture of putty whiting, a baking lacquer paint and a melamine alkyd resin. The baking lacquer paint is added to the putty whiting a little at a time, stirring constantly until the product has a consistency similar to that of tafiy. The melamine alkyd resin is then added and the product thoroughly mixed by stirring.

Specific examples of the undercoating are as follows:

The proportions of the ingredients may be varied as desired to obtain the consistency desired and those listed above are merely illustrative. Expressed in weight, to approximately a pound of putty whiting is added the lacquer paint until it becomes a pasty consistency. Approximately 3-4 ounces of the melamine alkyd resin may the resin does not change the consistency.

n Percent Alkyd"'resin" 52 Melamine resin; 13 Pi ment, 35

The -melamine alkyda resin is a combination of alkyd resin and 251%? *mlaniine resini The alkyd resin is of the soyaebakingittypee A -suitable"exampleof alkyd resin is? t r The melamine resia'may-b-e any ofthi's'typ'e Dimeramine+forrnaldehydeflresins;' such as'Tthefmelamine resin preparedby'Eohr'ntltHaasof Philadelphia; Pennsylvania, underthe trade-namediofUtorrnit. M. M; 55 I p The undereoating is'fappliedfas necessar to buildi up the"damaged"surfaee"andgfthen is allowed to. harden for several hours," ahd 'when thorouglrlly hardened, is smoothed down'withw'eryi'fine emerypfapier an'tlis new readyfor theglazje coatingjl The glaze outer. co'atin'g is"compounded of 'b'akinge'n aural; melamineflalkiyd resin; ahdf" xylel r'esin solution; The-nielamineialkydresin is. adde'dj'to tne'bakragenamel tim'euntil the 'solutibnis thinenou lt fer sprayingithraugn a'spraygun n Examples of theglaze are as tbltowsr Example r r Partsbyt-weight Baking-.enamel .30 Xylol-resin solutio y. Melamine alkyd-resin Example 2 Percent by volume Baking enamel 65-75 Xylol-resin solution 15-35 Melamine alkyd resin 1-10 A suitable baking enamel has been obtained from ONeil-Duro Company identified as Duro, and designated 49-W-1 White Syn For. It is understood that a suitable baking enamel consists of approximately 30% pigment such as titanium dioxide and 70% varnish made up of 40% alkyd-linseed-soya and 60% mineral spirits.

The alkyd-linseed-soya varnish can be a mixture of 8.3 pounds of phthalic anhydride-glycerol resin per gallon of vehicle (linseed oil and soya fatty acid) heated to a high degree and thinned with xylol.

The melamine-alkyd resin may be the same as the like ingredient in the undercoating.

The xylol-resin solution is a 50% solution of melamine resin and 50% xylol.

Immediately after the glaze is applied, the work is baked with a heating lamp at approximately 300 F. for fifteen minutes. The baking period may have to be increased depending upon the thickness of the object being repaired. Of course, colors or tints are added to the glaze to make it match the object which is being repaired.

The compositions and process outlined herein have given remarkable results in restoring damaged porcelain. The outer glaze coating can be baked on in situ using an infra red lamp. This process is very economical, and simple to use.

It will be obvious to those skilledin the art that various aeaasoe changes may be made without departing from the spirit of the invention and therefore the invention is not limited to what is described in the specification, but only as indicated in the appended claims.-

What is claimed is: t t

,1. A process forrepairing damagedporcelain comprising applying an undercoating onto the damaged portion of the porcelain until the damaged surface is built up to the, desired shape, allowing said undercoating to harden, applying a glaze outer coating thereon, and baking said glaze outer coating, said undercoating consisting essentially of a'mixture of 67-75% whiting, 5.254225% pigment, 2.2-7% melamine resin and alkyd 8.625.7% resin, and said glaze outer coating consisting essentially of a mixture of 65-75% alkyd baking enamel, 15.35% of a mixture of xylol and a melamine resin, and l-l'% of a mixture of a melamine resin and an alkyd resin.

2. -A process for repairing damaged porcelain comprising applying an undercoating onto the damaged portion of the porcelain, allowing said undercoating to harden, applying a glaze outer coating thereon, and baking said glaze outer coating, said undercoating consisting essentially of approximately 65-75% putty whiting, -35 baking lacquer paint and l-l0% melamine-alkyd resin mixture, said baking lacquer paint consisting essentially of 52% alkyd resin, 13% melamine resin and 35% pigment, said melamine-alkyd resin mixture consisting essentially of 75% alkyd resin and melamine resin, said glazeouter coating consisting essentially of approximately 65-75% baking enamel, l5-35% xylol-resin solution and 1-10% melamine-alkyd resin mixture, said baking enamel consisting essentially of pigment and 70% varnish made up of alkyd resin and 60% mineral spirits, said melamine-alkyd resin mixture consisting essentially ,of 75 alkyd resin and 25 melamine resin, and said -xylol-resin solution consisting essentially of melamine resin and 50% xylol.

3. A composition suitable for use as an undercoating for use in repairing damaged porcelain consisting essentially of approximately 65-75% putty whiting, 15-35% baking lacquer paint and 1-10% melamine-alkyd resin mixture, said baking lacquer paint consisting essentially of 52% alkyd resin, 13% melamine resin and 35 pig- 4 ment, said melamine-alkyd resin mixture consisting essentially of 75 alkyd resin and 25 melamine resin.

4. A composition suitable for use as an outer glaze coating for use in repairing damaged porcelain consisting essentially of approximately 65-75% baking enamel, 15-35% xylol-resin solution and- 1-10% melamine-alkyd resin mixture, said baking'enamel consisting essentially of 30% pigment and 70% varnish made up of 40% alkyd resin and mineral spirits, said melamine-alkyd resin mixture consisting essentially of 75% alkyd resin and 25 melamine resin, and said xylol-resin solution consisting essentially of 50% melamine resin and 50% xylol.

5. A composition suitable for use as an undercoating for use in repairing damaged porcelain consisting essentially of approximately -75% putty whiting, 15-33% baking lacquer paint and 1-10% melamine-alkyd resin mixture, said baking lacquer paint consisting essentially of 52% alkyd resin, 13% melamine resin and 35% pigment, said melamine-alkyd resin mixture consisting essentially of 75 alkyd resin and 25% melamine resin, and as a glaze outer coating approximately '65-75% baking enamel,'15-35% xylol-resin solution .and l-10% melamine-alkyd resin mixture, said baking enamel consisting essentially of 30% pigment and varnish made up of 40% alkyd resin and 60% mineral spirits, said melamine-alkyd resin mixture consisting essentially of alkyd resin and 25% melamine resin, and said xylol-resin solution consisting essentially of 50% melamine resin and 50% xylol. I

References Cited in the file of this patent UNITED STATES PATENTS Great Britain Feb. 27, 1947 

1. A PROCESS FOR REPAIRING DAMAGED PORCELAIN COMPRISING APPLYING AN UNDERCOATING ONTO THE DAMAGE PORTION OF THE PORCELAIN UNTIL THE DAMAGED SURFAC IS BUILT UP TO THE DESIRED SHAPE, ALLOWING SAID UNDERCOATING TO HARDEN, APPLYING A GLAZE OUTER COATING THEREON, AND BAKING SAID GLAZE OUTER COATING, SAID UNDERCOATING CONSISTING ESSENTIALLY OF A MIXTURE OF 67-75% WHITING, 5.25-12.25% PIGMENT, 2.2-7% MELAMINE RESIN AND ALKYD 8.6-25.7% RESIN, AND SAID GLAZE OUTER COATING CONSISTING ESSENTIALLY OF A MIXTURE OF 65-75% ALKYD BAKING ENAMEL, 15.35% OF A MIXTURE OF XYLOL AND A MELAMINE RESIN, AND 1-10% OF A MIXTURE OF A MELAMINE RESIN AND AN ALKAYD RESIN. 